bcachefs (loop0): reading snapshots done
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BUG: KASAN: null-ptr-deref in __do_six_trylock+0x24a/0x7b0
Read of size 4 at addr 0000000000000000 by task syz.0.1541/13412

CPU: 0 UID: 0 PID: 13412 Comm: syz.0.1541 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 kasan_report+0x118/0x150
 kasan_check_range+0x2b0/0x2c0
 __do_six_trylock+0x24a/0x7b0
 six_lock_ip_waiter+0xbf/0x170
 btree_key_cache_fill+0x5dd/0x3010
 bch2_btree_path_traverse_cached+0xc5d/0x10d0
 bch2_btree_path_traverse_one+0x372/0x21d0
 bch2_trans_update_get_key_cache+0x557/0xf20
 bch2_trans_update_ip+0x958/0x1db0
 bch2_btree_insert+0x2ea/0x5d0
 bch2_fs_initialize+0xf3d/0x1550
 bch2_fs_start+0xaa0/0xda0
 bch2_fs_get_tree+0xb39/0x1520
 vfs_get_tree+0x92/0x2b0
 do_new_mount+0x2a2/0x9e0
 __se_sys_mount+0x317/0x410
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f316a39038a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f316b1b1e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f316b1b1ef0 RCX: 00007f316a39038a
RDX: 0000200000000140 RSI: 0000200000000000 RDI: 00007f316b1b1eb0
RBP: 0000200000000140 R08: 00007f316b1b1ef0 R09: 0000000002800000
R10: 0000000002800000 R11: 0000000000000246 R12: 0000200000000000
R13: 00007f316b1b1eb0 R14: 0000000000005ae3 R15: 0000200000000480
 </TASK>
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