bisecting fixing commit since f2d285669aae656dfeafa0bf25e86bbbc5d22329
building syzkaller on 676bd07e7e80f8a270af7f0276443c68f4a99e25
testing commit f2d285669aae656dfeafa0bf25e86bbbc5d22329 with gcc (GCC) 8.1.0
kernel signature: 4b6497d2fa94724a7d26fbf825f871399cd860330df2dc670f58e84f779175f7
run #0: crashed: WARNING in hfs_bnode_create
run #1: crashed: WARNING in hfs_bnode_create
run #2: crashed: WARNING in hfs_bnode_create
run #3: crashed: WARNING in hfs_bnode_create
run #4: crashed: WARNING in hfs_bnode_create
run #5: crashed: WARNING in hfs_bnode_create
run #6: crashed: WARNING in corrupted
run #7: crashed: WARNING in hfs_bnode_create
run #8: crashed: WARNING in hfs_bnode_create
run #9: crashed: WARNING in hfs_bnode_create
testing current HEAD 15bc20c6af4ceee97a1f90b43c0e386643c071b4
testing commit 15bc20c6af4ceee97a1f90b43c0e386643c071b4 with gcc (GCC) 8.1.0
kernel signature: 163f41101b62a4f55179e9a22b2fc554a31ec20fa0e8b5cc79ced9610c9169c3
run #0: crashed: WARNING in hfs_bnode_create
run #1: crashed: WARNING in hfs_bnode_create
run #2: crashed: WARNING in hfs_bnode_create
run #3: crashed: WARNING in hfs_bnode_create
run #4: crashed: WARNING in hfs_bnode_create
run #5: crashed: WARNING in corrupted
run #6: crashed: WARNING in corrupted
run #7: crashed: WARNING in hfs_bnode_create
run #8: crashed: WARNING in hfs_bnode_create
run #9: crashed: WARNING in hfs_bnode_create
revisions tested: 2, total time: 14m26.37718648s (build: 7m57.577508171s, test: 5m48.809872852s)
the crash still happens on HEAD
commit msg: Merge tag 'tty-5.9-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
crash: WARNING in hfs_bnode_create
IPVS: ftp: loaded support on port[0] = 21
hfs: unable to locate alternate MDB
hfs: continuing without an alternate MDB
hfs: new node 0 already hashed?
------------[ cut here ]------------
WARNING: CPU: 1 PID: 3661 at fs/hfs/bnode.c:416 hfs_bnode_create.cold.13+0xe/0x1b fs/hfs/bnode.c:415
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 3661 Comm: syz-executor4 Not tainted 5.9.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0xb9/0xf1 lib/dump_stack.c:118
 panic+0x115/0x30c kernel/panic.c:231
 __warn.cold.13+0x20/0x26 kernel/panic.c:600
hfs: unable to locate alternate MDB
 report_bug+0xc5/0x100 lib/bug.c:198
 handle_bug+0x39/0xa0 arch/x86/kernel/traps.c:234
 exc_invalid_op+0x18/0x70 arch/x86/kernel/traps.c:254
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536
RIP: 0010:hfs_bnode_create.cold.13+0xe/0x1b fs/hfs/bnode.c:416
Code: f6 e8 5a aa c6 ff e9 22 f6 ff ff 48 c7 c7 38 19 9a 83 e8 49 aa c6 ff e9 1a fd ff ff 89 de 48 c7 c7 88 19 9a 83 e8 36 aa c6 ff <0f> 0b e9 47 ff ff ff cc cc cc cc cc cc 55 48 89 e5 41 57 41 56 49
RSP: 0018:ffffc900003d7bd8 EFLAGS: 00010246
RAX: 000000000000001f RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff888218518e20 RDI: ffff888218518e20
RBP: ffffc900003d7c08 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000001 R11: a6bbbf94605eafa6 R12: ffff8882093f10e0
R13: ffff888207f13840 R14: ffff8882093f1000 R15: ffff888207f13840
hfs: continuing without an alternate MDB
 hfs_bmap_alloc+0x218/0x270 fs/hfs/btree.c:288
 hfs_bnode_split+0x37/0x390 fs/hfs/brec.c:241
 hfs_brec_insert+0xce/0x370 fs/hfs/brec.c:102
 hfs_cat_create+0x298/0x2f0 fs/hfs/catalog.c:131
 hfs_mkdir+0x3c/0xa0 fs/hfs/dir.c:231
hfs: unable to locate alternate MDB
 vfs_mkdir+0x10d/0x1c0 fs/namei.c:3649
 do_mkdirat+0xe3/0x110 fs/namei.c:3672
 __do_sys_mkdir fs/namei.c:3688 [inline]
 __se_sys_mkdir fs/namei.c:3686 [inline]
 __x64_sys_mkdir+0x16/0x20 fs/namei.c:3686
 do_syscall_64+0x37/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4554a9
Code: 9d b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 6b b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fb682c96c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007fb682c976d4 RCX: 00000000004554a9
RDX: 0000000000000000 RSI: 0000000000000021 RDI: 0000000020000180
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000003ea R14: 00000000006f8e90 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..