BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 0 P4D 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 297 Comm: syz-executor793 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffffc90000b278d8 EFLAGS: 00010246
RAX: 1ffffffff0d3836f RBX: 1ffff110203bf331 RCX: dffffc0000000000
RDX: ffffc90000b27980 RSI: ffffc90000b27960 RDI: ffff8881083f4980
RBP: ffffc90000b27ad0 R08: ffff888101df99bf R09: 1ffff110203bf337
R10: dffffc0000000000 R11: ffffed10203bf338 R12: ffff888101df99b8
R13: ffff888101df9988 R14: ffffffff869c1b78 R15: ffff8881083f4980
FS:  000055558432b3c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000100fab000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 snapshot_merge_next_chunks+0x249/0xbb0 drivers/md/dm-snap.c:1064
 start_merge drivers/md/dm-snap.c:1186 [inline]
 snapshot_merge_resume+0x24f/0x2a0 drivers/md/dm-snap.c:2334
 dm_table_resume_targets+0x222/0x360 drivers/md/dm-table.c:2282
 __dm_resume+0x25/0x180 drivers/md/dm.c:2611
 dm_resume+0x1c3/0x240 drivers/md/dm.c:2656
 do_resume drivers/md/dm-ioctl.c:1103 [inline]
 dev_suspend+0x2ae/0x5d0 drivers/md/dm-ioctl.c:1131
 ctl_ioctl drivers/md/dm-ioctl.c:1925 [inline]
 dm_ctl_ioctl+0x8ee/0xca0 drivers/md/dm-ioctl.c:1947
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl+0x121/0x1a0 fs/ioctl.c:739
 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:739
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fca6c428039
Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 d8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe81233d08 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffe81233e38 RCX: 00007fca6c428039
RDX: 0000200000000740 RSI: 00000000c138fd06 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007ffe81233e38 R09: 00007ffe81233e38
R10: 0000000000000013 R11: 0000000000000246 R12: 00007ffe81233e28
R13: 0000000000000002 R14: 00007fca6c4b8ca0 R15: 0000000000000002
Modules linked in:
CR2: 0000000000000000
---[ end trace adedcf182aa4ed47 ]---
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffffc90000b278d8 EFLAGS: 00010246
RAX: 1ffffffff0d3836f RBX: 1ffff110203bf331 RCX: dffffc0000000000
RDX: ffffc90000b27980 RSI: ffffc90000b27960 RDI: ffff8881083f4980
RBP: ffffc90000b27ad0 R08: ffff888101df99bf R09: 1ffff110203bf337
R10: dffffc0000000000 R11: ffffed10203bf338 R12: ffff888101df99b8
R13: ffff888101df9988 R14: ffffffff869c1b78 R15: ffff8881083f4980
FS:  000055558432b3c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000100fab000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400