=============================
WARNING: suspicious RCU usage
syzkaller #0 Tainted: G             L     
-----------------------------
kernel/sched/core.c:9196 Illegal context switch in RCU-sched read-side critical section!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
locks held by syz-executor/5593: 9, last CPU#1:
 #0: ffffffff8ee35c10 (dup_mmap_sem){.+.+}-{0:0}, at: copy_mm+0x10f/0x480
 #1: ffff8881b7e369b8 (&mm->mmap_lock){++++}-{4:4}, at: dup_mmap+0x195/0x1dc0
 #2: ffff8881b806c378 (&mm->mmap_lock/1){+.+.}-{4:4}, at: dup_mmap+0x221/0x1dc0
 #3: ffffffff8ed5c6e0 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x29/0x240
 #4: ffff8881bd721498 (ptlock_ptr(ptdesc)#2){+.+.}-{3:3}, at: pte_offset_map_lock+0x13d/0x210
 #5: ffffffff8ed5c6e0 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x29/0x240
 #6: ffff8881bbd81978 (ptlock_ptr(ptdesc)#2/1){+.+.}-{3:3}, at: copy_pmd_range+0x6fb/0x5c10
 #7: ffffffff8ed5c7a0 (rcu_read_lock_sched){....}-{1:2}, at: pfn_valid+0xba/0x490
 #8: ffffc90000a18cc0 ((&vub300->inactivity_timer)){+.-.}-{0:0}, at: call_timer_fn+0xd5/0x5f0

stack backtrace:
CPU: 1 UID: 0 PID: 5593 Comm: syz-executor Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <IRQ>
 dump_stack_lvl+0xe8/0x150
 lockdep_rcu_suspicious+0x140/0x1d0
 __might_resched+0xbb/0x4c0
 __cancel_work_sync+0x6d/0x110
 mmc_free_host+0x19/0x30
 call_timer_fn+0x18d/0x5f0
 __run_timer_base+0x652/0x8b0
 run_timer_softirq+0xb7/0x170
 handle_softirqs+0x226/0x860
 __irq_exit_rcu+0xcb/0x220
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:pfn_valid+0x11f/0x490
Code: 74 7d e8 64 40 84 ff 4d 85 ff 75 11 e8 5a 40 84 ff eb 3d e8 53 40 84 ff 4d 85 ff 74 ef 4d 89 fd 49 c1 ed 03 43 80 7c 25 00 00 <74> 08 4c 89 ff e8 67 0a f4 ff 49 8b 2f 48 89 ee 48 83 e6 02 31 ff
RSP: 0018:ffffc90004ecf270 EFLAGS: 00000246
RAX: ffffffff8243764c RBX: ffffffff8243760a RCX: ffff8881bbc55a00
RDX: 0000000000000000 RSI: ffffffff8c6d9360 RDI: ffffffff8c6d9320
RBP: 0000000000000001 R08: 8700000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8ed5c7a0 R12: dffffc0000000000
R13: 1ffff11029fc1ad4 R14: 00000000001aef31 R15: ffff88814fe0d6a0
 page_table_check_set+0x25/0x530
 copy_pmd_range+0x4adc/0x5c10
 copy_page_range+0xc82/0x1290
 dup_mmap+0xf17/0x1dc0
 copy_mm+0x11a/0x480
 copy_process+0x1e75/0x43e0
 kernel_clone+0x2d7/0x940
 __x64_sys_clone+0x1b6/0x230
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fde20dc6bd2
Code: 89 e7 e8 71 8b f7 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 66 89 c5 85 c0 75 3b 64 48 8b 04 25 10 00 00
RSP: 002b:00007fffcd69d9a0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fffcd69d9a0 RCX: 00007fde20dc6bd2
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007fffcd69db2c R08: 0000000000000000 R09: 0000000000000001
R10: 000055555dce47d0 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000000927c0 R14: 0000000000017283 R15: 00007fffcd69db80
 </TASK>
BU
BUG: sleeping function called from invalid context at kernel/workqueue.c:4552
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 5593, name: syz-executor
preempt_count: 103, expected: 0
RCU nest depth: 2, expected: 0
locks held by syz-executor/5593: 9, last CPU#1:
 #0: ffffffff8ee35c10 (dup_mmap_sem){.+.+}-{0:0}, at: copy_mm+0x10f/0x480
 #1: ffff8881b7e369b8 (&mm->mmap_lock){++++}-{4:4}, at: dup_mmap+0x195/0x1dc0
 #2: ffff8881b806c378 (&mm->mmap_lock/1){+.+.}-{4:4}, at: dup_mmap+0x221/0x1dc0
 #3: ffffffff8ed5c6e0 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x29/0x240
 #4: ffff8881bd721498 (ptlock_ptr(ptdesc)#2){+.+.}-{3:3}, at: pte_offset_map_lock+0x13d/0x210
 #5: ffffffff8ed5c6e0 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x29/0x240
 #6: ffff8881bbd81978 (ptlock_ptr(ptdesc)#2/1){+.+.}-{3:3}, at: copy_pmd_range+0x6fb/0x5c10
 #7: ffffffff8ed5c7a0 (rcu_read_lock_sched){....}-{1:2}, at: pfn_valid+0xba/0x490
 #8: ffffc90000a18cc0 ((&vub300->inactivity_timer)){+.-.}-{0:0}, at: call_timer_fn+0xd5/0x5f0
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 1 UID: 0 PID: 5593 Comm: syz-executor Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <IRQ>
 dump_stack_lvl+0xe8/0x150
 __might_resched+0x36a/0x4c0
 __cancel_work_sync+0x6d/0x110
 mmc_free_host+0x19/0x30
 call_timer_fn+0x18d/0x5f0
 __run_timer_base+0x652/0x8b0
 run_timer_softirq+0xb7/0x170
 handle_softirqs+0x226/0x860
 __irq_exit_rcu+0xcb/0x220
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:pfn_valid+0x11f/0x490
Code: 74 7d e8 64 40 84 ff 4d 85 ff 75 11 e8 5a 40 84 ff eb 3d e8 53 40 84 ff 4d 85 ff 74 ef 4d 89 fd 49 c1 ed 03 43 80 7c 25 00 00 <74> 08 4c 89 ff e8 67 0a f4 ff 49 8b 2f 48 89 ee 48 83 e6 02 31 ff
RSP: 0018:ffffc90004ecf270 EFLAGS: 00000246
RAX: ffffffff8243764c RBX: ffffffff8243760a RCX: ffff8881bbc55a00
RDX: 0000000000000000 RSI: ffffffff8c6d9360 RDI: ffffffff8c6d9320
RBP: 0000000000000001 R08: 8700000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8ed5c7a0 R12: dffffc0000000000
R13: 1ffff11029fc1ad4 R14: 00000000001aef31 R15: ffff88814fe0d6a0
 page_table_check_set+0x25/0x530
 copy_pmd_range+0x4adc/0x5c10
 copy_page_range+0xc82/0x1290
 dup_mmap+0xf17/0x1dc0
 copy_mm+0x11a/0x480
 copy_process+0x1e75/0x43e0
 kernel_clone+0x2d7/0x940
 __x64_sys_clone+0x1b6/0x230
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fde20dc6bd2
Code: 89 e7 e8 71 8b f7 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 66 89 c5 85 c0 75 3b 64 48 8b 04 25 10 00 00
RSP: 002b:00007fffcd69d9a0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fffcd69d9a0 RCX: 00007fde20dc6bd2
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007fffcd69db2c R08: 0000000000000000 R09: 0000000000000001
R10: 000055555dce47d0 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000000927c0 R14: 0000000000017283 R15: 00007fffcd69db80
 </TASK>

=============================
WARNING: suspicious RCU usage
syzkaller #0 Tainted: G        W    L     
-----------------------------
kernel/rcu/srcutree.c:1468 Illegal synchronize_srcu() in same-type SRCU (or in RCU) read-side critical section!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
locks held by syz-executor/5593: 9, last CPU#1:
 #0: ffffffff8ee35c10 (dup_mmap_sem){.+.+}-{0:0}, at: copy_mm+0x10f/0x480
 #1: ffff8881b7e369b8 (&mm->mmap_lock){++++}-{4:4}, at: dup_mmap+0x195/0x1dc0
 #2: ffff8881b806c378 (&mm->mmap_lock/1){+.+.}-{4:4}, at: dup_mmap+0x221/0x1dc0
 #3: ffffffff8ed5c6e0 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x29/0x240
 #4: ffff8881bd721498 (ptlock_ptr(ptdesc)#2){+.+.}-{3:3}, at: pte_offset_map_lock+0x13d/0x210
 #5: ffffffff8ed5c6e0 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x29/0x240
 #6: ffff8881bbd81978 (ptlock_ptr(ptdesc)#2/1){+.+.}-{3:3}, at: copy_pmd_range+0x6fb/0x5c10
 #7: ffffffff8ed5c7a0 (rcu_read_lock_sched){....}-{1:2}, at: pfn_valid+0xba/0x490
 #8: ffffc90000a18cc0 ((&vub300->inactivity_timer)){+.-.}-{0:0}, at: call_timer_fn+0xd5/0x5f0

stack backtrace:
CPU: 1 UID: 0 PID: 5593 Comm: syz-executor Tainted: G        W    L      syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN, [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <IRQ>
 dump_stack_lvl+0xe8/0x150
 lockdep_rcu_suspicious+0x140/0x1d0
 __synchronize_srcu+0x157/0x2f0
 wakeup_source_unregister+0x129/0x3f0
 mmc_host_classdev_release+0x47/0x100
 device_release+0xc4/0x1f0
 kobject_put+0x222/0x550
 call_timer_fn+0x18d/0x5f0
 __run_timer_base+0x652/0x8b0
 run_timer_softirq+0xb7/0x170
 handle_softirqs+0x226/0x860
 __irq_exit_rcu+0xcb/0x220
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:pfn_valid+0x11f/0x490
Code: 74 7d e8 64 40 84 ff 4d 85 ff 75 11 e8 5a 40 84 ff eb 3d e8 53 40 84 ff 4d 85 ff 74 ef 4d 89 fd 49 c1 ed 03 43 80 7c 25 00 00 <74> 08 4c 89 ff e8 67 0a f4 ff 49 8b 2f 48 89 ee 48 83 e6 02 31 ff
RSP: 0018:ffffc90004ecf270 EFLAGS: 00000246
RAX: ffffffff8243764c RBX: ffffffff8243760a RCX: ffff8881bbc55a00
RDX: 0000000000000000 RSI: ffffffff8c6d9360 RDI: ffffffff8c6d9320
RBP: 0000000000000001 R08: 8700000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8ed5c7a0 R12: dffffc0000000000
R13: 1ffff11029fc1ad4 R14: 00000000001aef31 R15: ffff88814fe0d6a0
 page_table_check_set+0x25/0x530
 copy_pmd_range+0x4adc/0x5c10
 copy_page_range+0xc82/0x1290
 dup_mmap+0xf17/0x1dc0
 copy_mm+0x11a/0x480
 copy_process+0x1e75/0x43e0
 kernel_clone+0x2d7/0x940
 __x64_sys_clone+0x1b6/0x230
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fde20dc6bd2
Code: 89 e7 e8 71 8b f7 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 66 89 c5 85 c0 75 3b 64 48 8b 04 25 10 00 00
RSP: 002b:00007fffcd69d9a0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fffcd69d9a0 RCX: 00007fde20dc6bd2
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007fffcd69db2c R08: 0000000000000000 R09: 0000000000000001
R10: 000055555dce47d0 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000000927c0 R14: 0000000000017283 R15: 00007fffcd69db80
 </TASK>
ODEBUG: object ffffc90000a18a80 is NOT on stack ffffc90004ec8000, but annotated.
------------[ cut here ]------------
1
WARNING: lib/debugobjects.c:672 at __debug_object_init+0x2c4/0x3c0, CPU#1: syz-executor/5593
Modules linked in:
CPU: 1 UID: 0 PID: 5593 Comm: syz-executor Tainted: G        W    L      syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN, [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:__debug_object_init+0x2c4/0x3c0
Code: fd 06 cc 41 ff c7 44 89 3d 69 98 e8 15 48 c7 c1 80 9c 6d 8c 48 c7 c7 e0 9c 6d 8c 84 c0 48 0f 45 f9 48 89 de e8 ad 2c 3e fc 90 <0f> 0b 90 e9 c0 fe ff ff e8 4f 1c 00 00 8b 05 c1 ff 6e 0a 3b 05 bf
RSP: 0018:ffffc90000a189b8 EFLAGS: 00010046
RAX: 0000000000000050 RBX: ffffc90000a18a80 RCX: 8ac704cfefdfc200
RDX: 0000000000000100 RSI: 0000000000000100 RDI: 0000000000000000
RBP: ffff8881bbc55a20 R08: 0000000000000100 R09: 1ffff920001430e4
R10: dffffc0000000000 R11: fffff520001430e5 R12: ffff8881bbc99168
R13: ffff8881b80667a8 R14: dffffc0000000000 R15: 0000000000000001
FS:  000055555dce4500(0000) GS:ffff8882a8cda000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32723ffc CR3: 0000000164770000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 __synchronize_srcu+0x1d5/0x2f0
 wakeup_source_unregister+0x129/0x3f0
 mmc_host_classdev_release+0x47/0x100
 device_release+0xc4/0x1f0
 kobject_put+0x222/0x550
 call_timer_fn+0x18d/0x5f0
 __run_timer_base+0x652/0x8b0
 run_timer_softirq+0xb7/0x170
 handle_softirqs+0x226/0x860
 __irq_exit_rcu+0xcb/0x220
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:pfn_valid+0x11f/0x490
Code: 74 7d e8 64 40 84 ff 4d 85 ff 75 11 e8 5a 40 84 ff eb 3d e8 53 40 84 ff 4d 85 ff 74 ef 4d 89 fd 49 c1 ed 03 43 80 7c 25 00 00 <74> 08 4c 89 ff e8 67 0a f4 ff 49 8b 2f 48 89 ee 48 83 e6 02 31 ff
RSP: 0018:ffffc90004ecf270 EFLAGS: 00000246
RAX: ffffffff8243764c RBX: ffffffff8243760a RCX: ffff8881bbc55a00
RDX: 0000000000000000 RSI: ffffffff8c6d9360 RDI: ffffffff8c6d9320
RBP: 0000000000000001 R08: 8700000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8ed5c7a0 R12: dffffc0000000000
R13: 1ffff11029fc1ad4 R14: 00000000001aef31 R15: ffff88814fe0d6a0
 page_table_check_set+0x25/0x530
 copy_pmd_range+0x4adc/0x5c10
 copy_page_range+0xc82/0x1290
 dup_mmap+0xf17/0x1dc0
 copy_mm+0x11a/0x480
 copy_process+0x1e75/0x43e0
 kernel_clone+0x2d7/0x940
 __x64_sys_clone+0x1b6/0x230
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fde20dc6bd2
Code: 89 e7 e8 71 8b f7 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 66 89 c5 85 c0 75 3b 64 48 8b 04 25 10 00 00
RSP: 002b:00007fffcd69d9a0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fffcd69d9a0 RCX: 00007fde20dc6bd2
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007fffcd69db2c R08: 0000000000000000 R09: 0000000000000001
R10: 000055555dce47d0 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000000927c0 R14: 0000000000017283 R15: 00007fffcd69db80
 </TASK>
