MINIX-fs: mounting unchecked file system, running fsck is recommended
MINIX-fs: mounting unchecked file system, running fsck is recommended
BUG: unable to handle kernel NULL pointer dereference at           (null)
IP: test_and_set_bit arch/x86/include/asm/bitops.h:220 [inline]
IP: test_and_set_bit_lock arch/x86/include/asm/bitops.h:233 [inline]
IP: trylock_buffer include/linux/buffer_head.h:367 [inline]
IP: lock_buffer include/linux/buffer_head.h:373 [inline]
IP: alloc_branch fs/minix/itree_common.c:88 [inline]
IP: get_block+0x6a7/0x10f0 fs/minix/itree_common.c:191
PGD 9f98f067 P4D 9f98f067 PUD 85c5e067 PMD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 17609 Comm: syz-executor.3 Not tainted 4.14.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88804c7b04c0 task.stack: ffff8880398f8000
RIP: 0010:test_and_set_bit arch/x86/include/asm/bitops.h:220 [inline]
RIP: 0010:test_and_set_bit_lock arch/x86/include/asm/bitops.h:233 [inline]
RIP: 0010:trylock_buffer include/linux/buffer_head.h:367 [inline]
RIP: 0010:lock_buffer include/linux/buffer_head.h:373 [inline]
RIP: 0010:alloc_branch fs/minix/itree_common.c:88 [inline]
RIP: 0010:get_block+0x6a7/0x10f0 fs/minix/itree_common.c:191
RSP: 0018:ffff8880398ff680 EFLAGS: 00010246
RAX: 0000000000000007 RBX: ffff8880398ff788 RCX: 1ffffffff10279fc
RDX: 0000000000000000 RSI: ffffffff87d842e0 RDI: ffff88804c7b04e4
RBP: ffff8880398ff800 R08: 0000000000000001 R09: 0000000000000002
R10: ffff88804c7b0d98 R11: ffff88804c7b04c0 R12: ffff8880398ff74c
R13: ffff8880826fd0c0 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007f7f032cc700(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000a8624000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 minix_get_block+0xd6/0x100 fs/minix/inode.c:379
 __block_write_begin_int+0x337/0x1030 fs/buffer.c:2038
 __block_write_begin fs/buffer.c:2088 [inline]
 block_write_begin+0x58/0x260 fs/buffer.c:2147
 minix_write_begin+0x35/0xc0 fs/minix/inode.c:415
 generic_perform_write+0x1c9/0x420 mm/filemap.c:3047
 __generic_file_write_iter+0x227/0x590 mm/filemap.c:3172
 generic_file_write_iter+0x2fa/0x650 mm/filemap.c:3200
 call_write_iter include/linux/fs.h:1778 [inline]
 do_iter_readv_writev+0x3df/0x600 fs/read_write.c:675
 do_iter_write fs/read_write.c:954 [inline]
 do_iter_write+0x152/0x550 fs/read_write.c:935
 vfs_writev+0x170/0x2a0 fs/read_write.c:999
 do_pwritev+0x161/0x200 fs/read_write.c:1088
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45c829
RSP: 002b:00007f7f032cbc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000128
RAX: ffffffffffffffda RBX: 00000000004fa800 RCX: 000000000045c829
RDX: 000000000000000d RSI: 0000000020003c00 RDI: 0000000000000004
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000873 R14: 00000000004cb2d9 R15: 00007f7f032cc6d4
Code: ca 08 00 00 49 8b bf 28 01 00 00 b9 08 00 00 00 e8 af f7 c5 ff 31 d2 be 74 01 00 00 48 c7 c7 e0 f3 b9 86 49 89 c7 e8 69 34 6d ff <f0> 41 0f ba 2f 02 0f 83 1f fe ff ff e8 b8 1e 89 ff 4c 89 ff e8 
RIP: test_and_set_bit arch/x86/include/asm/bitops.h:220 [inline] RSP: ffff8880398ff680
RIP: test_and_set_bit_lock arch/x86/include/asm/bitops.h:233 [inline] RSP: ffff8880398ff680
RIP: trylock_buffer include/linux/buffer_head.h:367 [inline] RSP: ffff8880398ff680
RIP: lock_buffer include/linux/buffer_head.h:373 [inline] RSP: ffff8880398ff680
RIP: alloc_branch fs/minix/itree_common.c:88 [inline] RSP: ffff8880398ff680
RIP: get_block+0x6a7/0x10f0 fs/minix/itree_common.c:191 RSP: ffff8880398ff680
CR2: 0000000000000000
minix_free_inode: bit 1 already cleared
---[ end trace f1b050bfcc94983c ]---